The cotton fibers are made conductive by coating the fibers, first with gold nanoparticles, and then with a thin layer of PEDOT.

FORBES: Weaving Cotton Transistors For Wearable Computing

In ablative (wounding) laser resurfacing, a laser beam destroys the outer layer of skin (epidermis) and heats the underlying skin (dermis), which stimulates the growth of new collagen fibers.

CNN: Wrinkles